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A141507
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Number of n X n binary matrices, symmetric under 90 degree rotation, with no more than 2 ones in any 2 X 2 subblock.
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0
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1, 2, 1, 5, 7, 49, 93, 1237, 4141, 89949, 498037, 18459425, 173151965, 10776871089, 170022693228, 17856702680623, 475042622997955, 84045266807297263, 3767160477564182682, 1123350438602153100399, 84860275331624989832681, 42642871075536884664453747
(list; graph; refs; listen; history; internal format)
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